I've shot a lot of whitetails, some of them pretty heavy, with 130gr. Sierra Pro-Hunters out of a .270, and never had an issue. I was running them over 3000fps, too, the old classic load with H4831SC. The deer dropped like they fell in a hole.
Using a 7mm with 120s, I'd probably back it down a bit, to 2800 or so, and use the heck outa them. I'll guarantee the corn-fed Missouri whitetails I've shot were heavier than those little Florida swamp deer, yet they die easy if you hit 'em right.
